摘要:

of the Society for Analytical Chemistry CONTENTS Reports of Meetings . . . . 203 Summaries of Papers “Why Particle-size Analysis ?” 204 “Membrane Electrodes” .. 209 Obituary . . . . . . . . 209 Analytical Reagents for Atomic- . . 2 I0 Papers Accepted for The Analyst 2 I2 Publications Received . . . . 214 Notices . . . . . . . . 21 5 Announcements . . . . . . 217 Forthcoming Meetings Back cover Membership Changes . . .. 210 Absorption Spectroscopy Proc. SOC. Analyt. Chem. Vol. 6 7 No. 12 Pages 203-218 December 1969 Vol. 6 No. 12 December I969 PROCEEDINGS THE SOCIETY FOR ANALYTICAL CHEMISTRY OF Presidwt of the Society T. S. West Hon. Secretary of the Society W. H. C. Shaw Hon. Treasurer of the Society G. W. C. Milner Hon. Assistant Secretaries of the Society D. I. Coomber; D. W. Wilson Secretary Miss P.E. Hutchinson 9/10 SAVILE ROW LONDON W I X IAF Editor J. B. A t t r i l l Telephone 01-734 3419 Telephone 01-734 6205 Proceedings is published by The Society for Analytical Chemistry and distributed t o all members of the Society and t o subscribers with The Analyst; subscriptions cannot be accepted for Proceedings alone. Single copies may be obtained direct from the Society’s Distribution Agents The Chemical Society Publications Sales Office Blackhorse Road Letchworth Herts. (NOT through Trade Agents) price 0 The Society for Analytical Chemistry 5s. post free. Remittances MUST accompany orders. THE SOCIETY FOR ANALYTICAL CHEMISTRY Dr. A. A. SMALES O.B.E. F.R.I.C. will lecture on Analytical Cosmochemistry (or Migrants from Outer Space enter the Chemical Laboratory) Wednesday February llth 1970 at 4.30 p.m. in the Department of Mechanical Engineering Imperial College London S.W.7

ISSN:0037-9697    

DOI:10.1039/SA96906FX041

出版商:RSC    

年代:1969

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THE SOCIETY FOR ANALYTICAL CHEMISTRY REPORTS OF THE ANALYTICAL METHODS COMMITTEE The Reports of the Analytical Methods Committee listed below may be obtained direct from The Society for Analytical Chemistry Book Department 9/10 Savile Row London W1X 1AF (not through Trade Agents) a t the price of 1s. 6d. to members of the Society and 2s. 6d. to non-members Remittances must accompany orders and be made payable to “Society for Analytical Chemistry.” Additives in Animal Feeding Stuffs Sub-committee Certain Reports published before 1946 have been omitted from this list but are still available. Report of the Antibiotics Panel The Determination of Penicillin Chlortetracycline and Oxytetracycline Report of the Hormones Panel The Determination of Stilboestrol and Hexosterol in Compound Report of the Prophylactics Panel The Determination of Nitrofurazone in Compound Feeding Stuffs.Report of the Vitamins (Water-soluble) Panel The Determination of Water-soluble Vitamins in Report of the Vitamins (Fat-soluble) Panel The Determination of Fat-soluble Vitamins in Diet Report of the Prophylactics in Animal Feeds Sub-committee The Determination of Amprolium in Report of the Prophylactics in Animal Fceds Sub-committee The Determination of Sulphaquinoxaline. Report of the Prophylactics in Animal Feeds Sub-committee The Determination of Acinitrazole. Report of the Prophylactics in Animal Feeds Sub-committee The Determination of Ethopabate in Report of the Prophylactics in Animal Feeds Sub-committee The Determination of Furazolidone Report of the Prophylactics in Animzl Feeds Sub-Committce The Determination of IXmetridazole in in Diet Supplements and Compound Feeding Stuffs.Feeding Stuffs. Compound Feeding Stuffs. Supplements and Compound Feeding Stuffs. Animal Feeding Stuffs. Feeds. in Feeds. Animal Feeds. Analytical Standards Sub-committee Sodium Carbonate as a Primary Standard in Acid - Base Titrimetry. Sulphamic Acid as a Primary Standard in Acid - Base Titrimetry. The Semi-micro-determination of Chlorine in Agricultural Technical Organic Chemicals and their Chlorine in Organic Compounds Sub- Committee Formulations. Essential Oils Sub-committee Report No. 15. Application of Gas - Liquid Chromatography to Essential-oil Analysis Interim Report on the Spectral Characteristics of Eugenol. Fish Products Sub-Committee. Nitrogen Factor for Cod Flesh.Meat Products Sub-Committee (formerly Meat Extract Sub-Committee) Analysis of Meat Extract Determination of Gelatin in Meat Extract and Meat Stocks Interim Report. Nitrogen Factors for Pork and Nitrogen Content of Rusk Filler (as one reprint). Nitrogen Factors for Beef. Nitrogen Factors for Chicken. Nitrogen Factors for Liver. Nitrogen Factor for Veal. Nitrogen Factors for Turkey. Nitrogen Content of Rusk Filler. Nitrogen Factor for Kidney. Nitrogen Factor for Tongue. Nitrogen Factor for Barley. Nitrogen Factor for Blood. Metallic Impurities in Foodstuffs Sub-Committee Determination of Lead in Foodstuffs Tentative Method. Metallic Impurities in Organic Matter Sub-Committee Methods for the Destruction of Organic Matter. Notes on Perchloric Acid and its Handling in Analytical Work.The Determination of Lead. The Determination of Small Amounts of Arsenic in Organic Matter. The Determination of Small Amounts of Copper in Organic Matter. The Determination of Small Amounts of Mercury in Organic Matter. The Determination of Small Amounts of Tin in Organic Matter. The Determination of Small Amounts of Zinc in Organic Matter. The Use of 50 per cent. Hydrogen Peroxide for the Destruction of Organic Matter. The Determination of Small Amounts of Tin in Organic Matter. Determination of Linalol in Essential Oils. Determination of Citronellol in Admixture with Geraniol. Part 1. Amounts of Tin up to 30 pg. Part 2. Amounts of Tin from 30 to 150 pg. Vitamin-E Panel Pesticides Residues in Foodstuffs Sub-committee The Determination of Tocopherols in Oils Foods and Feeding Stuffs.Determination of Small Amounts of Total Organic Chlorine in Solvent Extracts of Vegetable Material. THE SOCIETY FOR ANALYTICAL CHEMISTRY Forthcoming Meetings January Wednesday 14th LONDON Thursday 15th BIRMINGHAM Friday 16th CARDIFF Saturday 17th MAKCHESTER Wednesday 22st DURHAM Wednesday 21st NOTTINGHAM Friday 23rd GLASGOW MICXOCHEMICAL METHODS GROUP London Discussion Meeting. Leicester Lounge Glasshouse Street London W. 1 ; 6.30 p.m. MITILAKDS SECTION Meeting for the reading of the Elwell Award papers. The University Birmingham ; 6.30 p.m. WESTERN SECTION Annual General Meeting followefl by an Ordinary Meeting. “The Impact of lnstrurnental Methods on Organic Analysis,” by A. G. Jones. University of Wales Institute of Sciencc and Technology Cathays Park NORTH OF ENGLAND SECTION Annual General Meeting followed by an ‘The Application of the Moving Wire Detector to Column Chromatography,” Midland Hotel Manchester ; 2.30 p.m. NORTH EAST SECTION Annual General Meeting followed by an Ordinary “Considerations of the Feasibility of the Chemical Synthesis of Food,” by Chemistry Department The University Durham ; 6.30 p.m. MIDLANDS SECTION and PARrrcLE SIZE ANALYSIS GROUP on “Particle Size Speakers T. Allen and Professor H. Heywood. Nottingham; 6.30 p.m. SCOTTISH SECTION Annual General Meeting followed by an Ordinary Meeting. “Applications of Specific Ion Electrodes,” by A. A. Diggens. University of Strathclyde Glasgow ; 5.30 p.m. “Elcctron Probe Microanalysis,” by D. A. Pantony Cardiff; 6 p.m. Ordinary Meeting. by P. Williamson. Meeting. M. Pyke. Analysis-How and Why.” Printed by W Heffer & Sons Ltd Cambridge England

ISSN:0037-9697    

DOI:10.1039/SA96906BX043

出版商:RSC    

年代:1969

数据来源: RSC

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December I969 Vol. 6 No. 12 PROCEEDINGS OF THE SOCIETY FOR ANALYTICAL CHEMISTRY Reports of Meetings ORDINARY MEETING AN Ordinary Meeting of the Society was held at 6.30 p.m. on Wednesday December 3rd) 1969 in Lecture Theatre B Department of Mechanical Engineering Imperial College S.W.7. The Chair was taken by the Chairman of the Programmes Committee Mr. A. G. Jones. The subject of the meeting was “Scanning Techniques” and the following papers were presented and discussed “X-ray Micro-analysis Techniques,” by Miss P. J. Killingworth ; “X-ray Milliprobe Analysis,” by J. D. Wilson ; “Examination of Surfaces by Scanning with Charged Particle Beams,” by T. B. Pierce. NORTH OF ENGLAND NORTH EAST AND SCOTTISH SECTIONS AND MICROCHEMICAL METHODS GROUP A JOINT Meeting of the North of England North East and Scottish Sections with the Micro- chemical Methods Group was held on Friday and Saturday November 7th and Sth 1969 a t the Central Hotel Carlisle.The Chair was taken in turn by the Chairman of the North of England Section Mr. R. Sinar and by the Chairman of the Scottish Section Dr. D. M. W. Anderson. The subject of the meeting was “Recent Advances in Pharmaceutical Analysis with Special Reference to Microchemical Techniques” and the following papers were presented and discussed “The Detection and Determination of Low Level Constituents in Pharmaceutical Products,” by C. A. Johnson; “Problems Associated with the Detection of Impurities in New Drugs,” by W. H. C. Shaw ; “The Determination of Parts per Million of Mercury in Eye Drops by Atomic Absorption,” by W. H. Harper; “Analysis of Degraded Pilocarpine Solutions,” by J.B. Murray; “The Use of the Vitatron Integrating Densitometer for the Direct Measurement of Substances Separated by Thin-layer Chromatography,” by W. H. C. Shaw; “The Deter- mination of Cephalosporin C in Fermentation Liquors with the Chromoscan Densitometer,” by P. Murray; “Some Experiences and Problems in Human Metabolic Research,” by A. Robertson; “The Application of Gas Chromatography to Official Monographs,” by J. C. Deavin. NORTH OF ENGLAND SECTION A JOINT Meeting of the Section with the Carlett Park Chemical and Physical Society was held a t 6.30 p.m. on Wednesday November 26th 1969 at the Carlett Park Central College of Further Education Eastham Wirral Cheshire. The Chair was taken by the Vice-chairman of the North of England Section Mr.G F. Longman. A lecture on “Steric Hindrance in Analytical Chemistry” was given by Professor H. M. N. H. Irving. SCOTTISH SECTION A JOINT Meeting of the Section with the Andersonian Chemical Society was held at 4 p.m. on Friday November 28th 1969 in the Thomas Graham Building University of Strathclyde Glasgow. The Chair was taken by the Chairman of the Andersonian Chemical Society Mr. I. Soutar. The following paper was presented and discussed “The Impact of Instrumental Methods on Organic Analysis,” by A. G. Jones. WESTERN SECTION A DISCUSSION Meeting of the Section was held at 6.30 p.m. on Friday November 14th 1969 a t the George Hotel Chepstow. The Chair was taken by the Chairman of the Section Dr. D. Betteridge. A discussion on “Determination of Moisture” was introduced by C.Harris. 203 204 WHY PARTICLE SIZE ANALYSIS? [Proc. SOC. Analyt. Chem. MIDLANDS SECTION AN Ordinary Meeting of the Section was held at 6.30 p.m. on Wednesday November 12th 1969 in the Haworth Lecture Theatre Chemistry Department The University Birmingham 15. The Chair was taken by the Chairman of the Section Mr. W. M. Lewis. The following papers were presented and discussed “The Micro-coulornetric Determina- tion of Nitrogen Chlorine and Sulphur in Hydrocarbons,” by F. C. A. Killer; “Some Modern Electroanalytical Techniques ” by P. Zuman. THERMAL ANALYSIS GROUP A DISCUSSION Meeting of the Group was held at 7.30 p.m. on Wednesday November 12th 1969 at the Leicester Lounge 44 Glasshouse Street London W.l. The Chair was taken by the Vice-chairman of the Group Dr. D. Dollimore. A discussion on “Some Aspects of Instrumentation” was introduced as follows “The Determination of Water,” by T. Y. Lees ; “Mass Spectrometry - Differential Thermal Analysis,” by M. Bracewell; “Low Temperature Differential Thermal Analysis,” by B. Treherne.

ISSN:0037-9697    

DOI:10.1039/SA9690600203

出版商:RSC    

年代:1969

数据来源: RSC

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204 WHY PARTICLE SIZE ANALYSIS? [Proc. SOC. Analyt. Chem. Why Particle-size Analysis? The following is a summary of one of the papers presented at an Ordinary Meeting of the Particle Size Analysis Group held on May 7th 1969 and reported in the June issue of Pyoceediwgs (p. 96). Summaries of the other papers presented at this Meeting were published in the September issue of Proceedings (p. 169). The Importance of Particle-size Analysis for Predicting the Practical Performance of Titanium Dioxide Pigments BY W. E. CRAKER (Lapovte Industvies Ltd. Ovganic and Pigments Division Stallingbovowgh Gvimsby Lincolnshive) TITANIUM dioxide pigment is used in surface coatings because it has a high scattering efficiency. A typical plot of scattering efficiency against particle diameter obtained from the Mie solution of Maxwell's equations is presented in Fig.1. This shows that there is a range over which pigment particles are extremely efficient but markedly dependent on particle size. Because of this it is usually considered necessary to have a reliable method of measuring the dis- tribution of particle diameters obtained from any production process. " 2 y- 2.0 1.0 B 0 I 6 Diameter pm Fig. 1. QgCB for m = 1.84 and hvac. = 0.55pm (when only points and dotted lines are shown there are not sufficient data to define the curve) December 19691 WHY PARTICLE-SIZE ANALYSIS ? 205 Light scattering techniques can be used for size measurements in this region but are neither as simple nor as applicable as some of the literature implies. Centrifugal techniques could be satisfactory but involve the use of high dilution.Partly for these reasons and partly for reasons that will be discussed later it was decided to adopt an electron-microscope method for obtaining the size distribution of titanium dioxide pigment particles. METHOD OF SIZE ANALYSIS- As it is possible to use a wide variety of definitions of the diameter of an approximately spherical particle it is important to define the diameter that was actually used. Each pigment particle has been assumed to he an approximately prolate spheroid that would project an ellipse on to an electron micrograph. Therefore a grid consisting of eighteen sets of ellipses with axial ratios ranging from 1 1 to 4 1 was prepared. Each set is the projection of a set of spheroids with identical volumes and is designated as having the diameter equal to that of a sphere of the same volume.In practice it was found that diameters starting at 0.08 pm and increasing in steps of 0.02 pm were adequate. Initially a conventional nitrocellulose mullout was used to disperse the pigment in readiness for application to the electron-microscope grid. Later in the work thin sections of dried paint film were used so that in addition to sizing the primary particles their state of dispersion could also be studied. The process of sizing a particle consists in deciding which ellipse best matches the image on the electron micrograph and the particle is assigned the diameter used to designate the set of which the ellipse is a member. As an example of the use of the procedure a group of eight different pigments was selected two samples of each pigment were taken one was given a random number between 1 and 8 and the other a random number between 9 and 16.The analyst prepared two grids from each sample and photographed two fields from each grid. The initial magnification on the plate was nominally 6000 times and the final magnification on the print was 20,000 times. An image of a diffraction-grating replica which served as a substrate on the grid was used to fix this exactly. The samples were processed in batches of four i.e. 1 to 4 5 to 8 etc. On each micrograph 125 particles were sized and eight separate micrographs were used to produce the 1000 estimates considered necessary for a particle-size determination. TABLE I TYPICAL SET OF RAW PARTICLE-SIZE DATA Number of particles with the diameter shown Diameter Pm 0.08 0.10 0.12 0.14 0-16 0.18 0.20 0.22 0.24 0.26 0.28 0.30 0.32 0.34 Sample 1 7 Grid 2 I Grid 1 7---7 r - - A - - 7 Field 1 Field 2 Field 1 Field 2 19 16 22 22 16 18 12 18 17 9 22 12 6 17 18 16 21 11 15 20 17 16 12 13 10 16 10 10 7 8 7 3 6 6 4 8 4 4 2 1 2 3 0 1 1 0 0 0 0 1 1 Sample 2 Grid 1 Grid 2 A I rField= % Z i 7 E z ? 12 10 19 16 13 13 10 23 17 14 7 9 18 9 10 14 8 17 9 14 20 12 27 10 10 21 13 15 13 15 16 7 8 6 7 12 4 5 6 2 1 3 1 1 1 2 Everything with a diameter of 0.09 pm or less is recorded as having a diameter of 0.08 pm.Table I presents raw particle-size data for one of the pigments. A conventional analysis of variance was carried out on the raw data obtained on all eight pigments an abbreviated table of the results of this analysis is presented in Table 11. 206 WHY PARTICLE-SIZE ANALYSIS ? [Proc.SOC. Analyt. Chem. The residual variance of 0-0031 with 7936 degrees of freedom is that component of the total variance which is not accounted for by the main effects and interactions. It is an estimate of the variance of a single diameter estimate that is it is the pooled variance of the eight particle-size distributions. The significant fourth order interaction which is present indicates that the precision of determining the mean diameter from a single micrograph is so high that the individual random errors of preparing that micrograph can be detected. The only other significant effects that have a physical reality are the difference between the pigments and the difference between the samples. The latter is a result of the experimental design the second sample of any pigment being examined after the first sample of all pigments had been completed.That is the samples are related by time and the operator was found to be sizing systematically larger throughout the course of the experiment. In principle this can be removed by training. TABLE I1 ANALYSIS OF VARIANCE Factor Degrees of freedom Mean square Significance Pigment . . . . .. .. 7 0.2700 > 99% Highly significant Sample . . .. . . .. 1 0.0463 95 to 99% Significant Field . . . . . . .. 1 0.0061 - .. . . .. 1 0.0127 - Grid . . Pigment Field Sample and Grid 53 0~0100 > 99% Highly significant Residual . . . . .. .. 7936 0*0031 - Best estimate of the combined effects of the residual and the random preparation errors is 0.01. i.e. 0.01 = 0.0031 + 125 0 i.e. 0 = 0.000055.Therefore variance of a single diameter estimate is 0 = 0-0031 + 0.000055. PRECISION OF THE METHOD- From this data it is possible to make an estimate of the total variance of a single diameter measurement and this is shown under Table 11. By using it the standard error of the number mean diameter for a total number of particles varying from 100 to 1000 distributed over one two three or four fields i.e. micrographs has been calculated. This is presented graphically in Fig. 2. It is interesting to note that it is more useful to increase the number of fields used than it is to increase the total number of particles. For example 1000 particles distributed from one field have the same standard error as about 200 particles distributed over four fields. I I 1 I 1 1 100 200 400 600 800 1000 Total number of particles Fig.2. Standard deviation of the number mean diameter as a function of the number of particles and the number of fields actually used This precision is such that when two pigments are compared by obtaining their respective number mean diameters from eight fields of 125 particles each then these means must be December 19691 WHY PARTICLE-SIZE ANALYSIS ? 207 different by a t least 0.009 pm for the pigments to be considered different. Any one number mean diameter can be quoted with 95 per cent. confidence limits of &0.006 pm. The num- ber mean diameters of the eight pigments are as follows 0.156 0.166 0.167 0.176 0.159 0-166 0.174 0.209. EFFECTS OF DISPERSION- Despite the precision with which it is possible to obtain these diameters they are not useful in predicting the performance of a pigment in a surface coating.In practice it is found that this could vary considerably depending upon the particular circumstances of formulation of the coating and its method of application. This is accepted in the surface- coating industry to be a result of differences in dispersion random associations or flocculation occurring in the surf ace-coating material. In a conventional gloss paint the volume concentration of pigment could be as high as 20 per cent and it is obvious that data obtained from detailed particle-size studies will probably not be relevant to the practical situation. To illustrate this five of the pigments which have already been sized were used to form a standard air-drying acrylic paint in which the pigment was present at a volume concentration of 15 per cent.Films of these paints were cast and the surface reflectance or gloss of each determined by a spectrophotogoniometric technique. For this measurement a standard black glass tile is used as a reference and the other gloss values are related to it. TABLE I11 GLOSS AND NUMBER MEAN DIAMETER Number mean diameter pm Gloss per cent. 0.1561 9.5 0.1591 31.0 0-166 47.0 0.167 34-5 0.176 37.5 { Standard black gloss tile . . 100 Diameters bracketed are statistically identical. Fig. 3. Electron micrograph of a thin section of a paint film. The upper surface is thc free surface of the paint film 208 WHY PARTICLE-SIZE ANALYSIS ? [Proc. SOC. Aaalyt. Chew. These gloss values together with the number mean diameters of the pigments used are presented in Table 111.It is immediately evident that there is little connection between the diameter of the pigment particle and the gloss of the paint made from it. Therefore such determinations of diameter are of little value in predicting or explaining the differences in gloss. A further example is provided by the investigation of the optical efficiency of five pig- ments different from those already discussed each of which has been subjected to two methods of dispersion in paint. The efficiencies measured by a Kubelka Munk scattering coefficient ranged from just over 6 ml-1 to 4 ml-1. Parallel with the measurements of optical efficiency thin sections of each paint film were cut and electron micrographs prepared. A typical micrograph is shown in Fig. 3. These were examined and the degree of grouping of the pigment particles studied.A group was defined as a collection of particles in which each one was in contact with at least one other member of the collection. It is possible simply by counting to obtain the mean number of particles in a group. Fig. 4 shows the scattering coefficient of the paint film plotted against the mean number in a group and it is evident that it is these groups rather than the primary particle size of the pigment that govern the efficiency. Mean number in an aggregate Fig. 4. Effect of aggregation on optical efficiency. Measurements made on paint films the symbols + 9 x m and A represent the five diffcrent pigments; when unringed they in- dicate that all are in one paint medium when ringed they indicate the other These two examples demonstrate that no matter how precisely it is possible to obtain the primary particle-size data these data are of little value in predicting the practical performance of the pigment.This is governed by the dispersion that prevails in the finished surface coating. C o N c L u s I o N This is an extremely obvious example of the confusion that could arise when precise particle-size data are obtained in the expectation that they will predict behaviour in general circumstances. In this particular case it is possible to size the particles with a high degree of precision. It is also possible to assess the practical performance of the particles with a reasonable degree of precision. However although the particle-size data and the performance are inter-dependent there is no simple functional relationship. Such situations can occur in a great many practical applications of particle-size measure- ments. The sizing process is carried out at dilutions and in dispersions that are not necessarily relevant to those actually used in practice. Therefore even when there is a known relation- ship between a size distribution and performance it may be better to use the performance data rather than obtain some sort of particle-size data. That is the selection of the appro- priate “particle-size parameter” is vital to the correct use of size analysis and may make a detailed particle-size analysis as such superfluous. The author acknowledges the assistance of his colleagues in preparing this paper and thanks the Directors of Laporte Industries Limited for permission to publish it.

ISSN:0037-9697    

DOI:10.1039/SA9690600204

出版商:RSC    

年代:1969

数据来源: RSC

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December 19691 OBITUARY 209 Obituary ALASTAIR CAMPBELL FRAZER IT was Boswell who pointed out how difficult it was for him to write about that important man Dr. Johnson and the writer of this obituary notice finds himself in the same predicament for Alastair Frazer was an amazing character and a really outstanding person. His sudden death shocked the medical and scientific world for his eminence in pharmacology and toxi- cology was undisputed. Alastair Campbell Frazer who seemed to the writer his usual cheery and charming self a couple of days before his death from a heart attack was born in 1909 was educated at Lancing College and received his medical training a t St. Mary’s Hospital London where amongst others he studied under one of our well-loved Past-Presidents Dr. Gerald Roche Lynch.His early interest was lipids but he soon became a leading world authority on toxicology and was particularly interested in the effects of food additives. After leaving St. Mary’s where he had been a lecturer in physiology and pharmacology and eventually became an acting professor he took the position of Professor of Medical Biochemistry and Pharmacology in the Birmingham University Medical School. Here he established a school which soon attracted world-wide attention. Amongst others he was Honorary Consultant in Metabolic Diseases to the British Army Adviser on Sprue etc. to the American Armed Forces Chairman of the Food Section of the International Union of Pure and Applied Chemistry President of the British Food Manufacturing Industries Research Association and also of BIBRA Chairman of the Food Research Committee a member of the Agricultural Research Council Scientific Adviser to the Ministry of Agriculture Fisheries and Food and an active member of the Joint FAO/WHO Expert Committee on Food Additives.He won many awards including our own Bernard Dyer Memorial Medal. In 1967 he left Birmingham and took over the position of Director General of the newly formed British Nutrition Foundation and just a few weeks before his death he had been appointed to succeed Sir Derrick Dunlop as Chairman of the Committee on Safety of Drugs. Besides his outstanding knowledge there was the added virtue of his charm and his engaging personality. It was always a pleasure to meet him socially or to sit a t Committee meetings with him. He had firm convictions based on his own experience; but he was always courteous to his opponents and understanding.The writer remembers an occasion in Rome when the representative of one country was being awkward about a certain matter. Alastair The positions he held were amazing. 210 ATOMIC-ABSORPTION SPECTROSCOPY [P?’OC. SOC. A“yt. CkzeW. Frazer undertook to discuss the matter quietly with him. Frazer’s persuasive charm and the diplomatic approach he adopted never losing patience won the day. Everyone had to respect his views. At his Memorial Service in Birmingham the address was given by Sir Solly Zuckerman who stressed his unique knowledge his friendliness and courtesy and said that he had never heard him say an unkind word about anyone especially his colleagues. We are all poorer for his passing and as an American admirer stated “we shall never see his like again.” To those of us who had the benefit of working closely with him especially in the British Industrial Biological Research Association he will always be remembered with affection and admiration. D. W. KENT- JONES

ISSN:0037-9697    

DOI:10.1039/SA969060209b

出版商:RSC    

年代:1969

数据来源: RSC

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210 ATOMIC-ABSORPTION SPECTROSCOPY [P?'OC. SOC. A " y t . CkzeW. Atomic-Absorption Spectroscopy Group Analytical Reagents for Atomic-Absorption Spectroscopy FINAL REPORT BY THE REAGENT SUB-COMMITTEE THE Reagent Sub-committee was formed by the Atomic-Absorption Spectroscopy Group in February 1967 to consider the need for reagents of a special degree of purity for use in the preparation of samples for analysis by atomic-absorption spectrophotometry and to approach major reagent manufacturers with a view to their being supplied. The Sub-committee consisted of Mr. D. Moore (Rank Precision Industries Ltd.) Mr. W. J. Price (Pye Unicam Ltd.) and Mr. R. A. White (British Non-Ferrous Metals Research Association). The Sub-committee first contacted a number of suppliers to establish general interest in the problem and then circulated a list of ideal specifications.The list included reagents that are widely used and recommended as releasing agents and ionisation buffers and also inorganic and organic solvents. These reagents which are used in large quantities relative to the concentrations of elements actually being determined need to be in a high state of purity with respect to the elements being determined. The specification was based on the best limits of detection in atomic absorption claimed by any instrument manufacturer at that time it being assumed that releasing agents and ionisation buffers would be present in amounts of up to 1 per cent. in the sample solution and that up to ten times as much solvent acid as sample might be used. The resulting limits for calcium magnesium sodium and potassium are given in Table I.From the reagent manufac- turers' point of view such impurity limits proved impracticable. December 19691 ATOMIC-ABSORPTION SPECTROSCOPY 211 TABLE I ORIGINAL IDEALISED TARGET SPECIFICATION Reagent Calcium p.p.m. Lanthanum oxide . . . . .. 0.2 Calcium chloride . . . . . . 0.2 Strontium chloride . . .. . . 0-2 EDTA . . . . . . .. .. 0-2 Hydrochloric acid . . . .. 0.02 Nitric acid . . .. . . I . 0.02 Perchloric acid . . . . . . 0.02 Ammonia . . . . .. .. 0-02 Hydrogen peroxide . . . . .. 0.02 Magnesium p.p.m. 0.03 0.03 0.03 0.03 0.003 0.003 0-003 0.003 0.003 Sodium Potassium p.p.m. p.p.m. Lithium chloride . . .. .. 0.5 0.5 There were two further aspects of the atomic-absorption reagents problem. One was felt to be the supply of stock solutions of metals of accurately known strength.As such solutions are considerably diluted in use the accent in this case is on accuracy rather than extreme purity. The second was the supply of suitable chelating reagents for extraction into organic solvents particularly ammonium pyrrolidine dithiocarbamate (APDC) which had recently been shown to be ideal for the extraction and concentration of heavy metals as a group. The three manufacturers primarily interested in this project were Messrs. B.D.H. Chemi- cals Ltd. Hopkin and Williams Limited and Johnson Matthey Chemicals Limited. During discussion with these manufacturers it was soon established that B.D.H. already had an interest in the production of high purity acids and standard solutions while Hopkin and Williams had been carrying out work on extraction systems including the use of APDC.Johnson Matthey had their range of Specpure chemicals. All three suppliers were interested in the problem of releasing agents particularly lanthanum oxide and undertook to suggest practical impurity levels that would be both an improvement on materials currently available and a reasonable compromise between purity and cost. The progress in this work was so good that Mr. D. J. Bucknell of Hopkin and Williams and Mr. A. G. Hill of K.D.H. contributed excellent reports at the annual general meeting of the Atomic-Absorption Spectroscopy Group in December 1968. All three manufacturers exhibited at the International Atomic-Absorption Spectroscopy Conference Sheffield July 1969. Materials suitable for atomic-absorption analysis now available from these three manu- facturers are summarised in Tables 11 I11 and IV which give the maximum limit of the impurity in all cases.It should also be recorded that Fisher Scientific Company in U.S.A. markets standardised solutions of metals for atomic- absorption analysis and APDC and isobutyl methyl ketone as “certified reagents. ” These materials are marketed in Great Britain by Kodak Limited Kirby Liverpool. Often the actual content is much less. TABLE 11 REAGENTS FOR ATOMIC ABSORPTION FROM B.D.H. CHEMICALS LTD. Reagent Maximum impurity level p.p.m. r -.a-pp- 7 Ca cu Fe Pb Mg Na r< Zn 6.5 per cent. LaC1 solution . . 0.2 0.1 0.2 0.2 0.1 - - 0.15 - 1.0 Lithium chloride . . .. . . 1-0 0.2 0-5 1.0 0-25 0.5 1.0 0.4 10 per cent. SrC1 solution . . 1.0 0.5 2.0 1.0 0.2 - 1000 p.p.m.stock solutions of Al Cd Ca Cu Fe Pb Mg Mn Ni and Zn mostly as chloride or nitrate Aristar range of high purity acids solvents etc. 212 PAPERS ACCEPTED FOR THE ANALYST TABLE III [PYOC. SOC. A ~ a l y t . Chem. REAGENTS FOR ATOMIC ABSORPTION FROM HOPKIN AND WILLIAMS LTD. Kcagent Maximum impurity level p.p.m. ‘Ca Co Cu Fe Pb Mg Ni K Na Zn APDC .. .. . . - 0.5 0.5 0.5 0.5 - 0.5 - - 0-5 CaIcium carbonate . . Calcium nitrate . . Strontium carbonate . . 5.0 - Strontium chloride . . 2.0 - - Lanthanum nitrate . . 3.0 - Lanthanum oxide . . 5-0 - Lithium hydroxide . . EDTA(NH,) } .. 2*o - Ag Na Sr Sn and Zn mostly in perchloric acid. methyl pentyl ketone isobutyl methyl ketone etc. - - - - 1.0 - 0.5 - 2-0 - 1.0 - 1.0 - 2.0 - 3.0 0.3 - - - - - - - - - - - I - - - - - - - - - - - - - - - - - - - - - - - - - - - - I - - 5.0 5.0 - - - - - EDTA and - 1000 p.p.rn.stock solutions of Al Sb As Ba Bi Cd Ca Cr Co Cu Fe Pb Mg Mn Hg Mo Ni K High purity ammonia hydrochloric acid hydrogen peroxide nitric acid perchloric acid sulphuric acid TABLE IV (Figures quoted are maximum total metallic impurities) REAGENTS SUITABLE FOR ATOMIC ABSORPTION FROM JOHNSON MATTHEY CHEMICALS LTD. Ionisation bztflevs- Lithium chloride lithium nitrate lithium carbonate caesium chloride caesium carbonate caesium nitrate potassium chloride potassium Releasing agegts- Strontium chloride . . . . . . . . . . .. . . Strontium carbonate . . .. .. . _ .. .. . . Strontium nitrate . . .. .. . . .. . . .. . . Calcium chloride . . . . ,. . . .. . . . . . . Calcium carbonate .. . . . . . . .. .. .. Aluminium chloride . . . . . . . . .. .. . . Reagents fov standavds- 70 elements in the form of Specpure metals and compounds. .. carbonate and potassium nitrate . . . . .. .. *Lanthanum oxide (Ca > 20 p.p.m.) . . . . . . .. .. * This material is now supplied by Rare Earth Products Ltd. 10 p.p.rn. 10 p.p.m. 20 p p m 10 p.p.m. 10 p.p.m. 10 p.p.m. 5 p.p.m. 100 p.p.m. It has been suggested to the three British manufacturers that analysts would welcome separate catalogues of reagents for atomic-absorption spectrophotometry and it is understood that these will be issued. A monograph on ammonium pyrrolidine dithiocarbanate has already appeared (Ammonium Pyrrolidine-Dithiocarbamate (APDC) Reagent for Various Metals by C. A. Watson. Monograph 74. Hopkin & Williams Ltd.) which gives full experimental details for the use of this reagent.

ISSN:0037-9697    

DOI:10.1039/SA969060210b

出版商:RSC    

年代:1969

数据来源: RSC

摘要:

212 PAPERS ACCEPTED FOR THE ANALYST [PYOC. SOC. AYtaZyt. Chew. Papers Accepted for Publication in The Analyst THE following papers have been accepted for publication in The AYcaZyst and are expected to appear in the near future. “Absorptiometric Determination of Monolinuron in Herbicide Formulation,” by S. H. “Automatic Methods for Determining Nitrate and Nitrite in Water and Soil Extracts,” “The Determination of Cinnamic Acid by Coulometric Titration with Amperometric Yuen. by A. Henriksen and A. R. Selmer-Olsen. End-point Detection,” by M. J. D. Brand B. Fleet and M. R. H. Weaver. December 19691 PAPERS ACCEPTED FOR THE ANALYST 213 “The Use of Paired Ion-sensitive Electrodes to Measure Gradients of pH Na and C1 Across Actively Transporting Membranes,” by D. M. Nutbourne. “Determination of Carbon-14 in Biological Material by Flask Combustion and Suspension Scintillation Counting of Calcium 14-labelled Carbonate,” by C.P. Lloyd- Jones. “The Determination of Harmful Trace Elements in Manganese Dioxide for Dry Cell Use,” by J. J. Vink. “Adaptation of the Bergman and Loxley Technique for Hydroxyproline Determination to the AutoAnalyzer and its Use in Determining Plasma Hydroxyproline in the Domestic Fowl,” by D. W. Bannister and A. B. Burns. “Separation of the Principal Components in Monazite,” by K. C. Hughes and D. J. Carswell. “A Thermogravimetric Method for the Analysis of Mixtures of Brushite and Monetite,” by V. J. Mulley and C. D. Cavendish. “The Spectrophotometric Determination of Microgram Amounts of Tin with Phenyl- fluorone,” by J. D. Smith. “The Determination of Magnesium Manganese Iron Copper and Zinc in Marine Shrimp,” by G.A. Knauer. “The Determination of Carbon Monoxide in Blood and Tissue,” by D. J. Blackmore. “Determination of Chromium in Aluminium Salts by Atornic-absorption Spectroscopy,” by G. B. Marshall and T. S. West. “A Method for the Determination of Aromatic Isocyanates in Air in the Presence of Primary Aromatic Amines,” by D. W. Meddle and R. Wood. “An Automated Method for the Determination of Cyclohexylamine in Cyclamate Sweet- ners,” by C. T. Berry and R. J. Crossland. “A Bathocuproine Reagent-paper for the Rapid Semi-quantitative Determination of Copper in the 1 to 700 p.p.m. Range,” by P. Hulthe. “Determination of Nitrate in Waters with the Nitrate-selective Ion Electrode,” by D. R. Keeney B. H. Brynes and J.J. Genson. “Separation and Detection of Volatile and Non-volatiIe N-Nitrosamines,” by C. L. Walters E. M. Johnson and N. Ray. “Automated Microbiological Assay. Part I. Experience in Assaying Ampicillin and Carbenicillin,” by A. Jones and G. Palmer. “Automated Microbiological Assays. Part 11. Design of the Assay Procedure,” by J. J. Grimshaw and A. Jones. “The Spectroscopic Determination of Sulphur and Phosphorus in Organic and Aqueous Matrices with a Simple Filter Photometer,” by K. M. Aldous R. M. Dagnall and T. S. West. “The Determination of Thiamine in Flour Fortification Mixtures,” by H. V. Hart and K. H. Willis. “The Use of Automation in Determining Nitrogen by the Kjeldahl Method with Final Calculations by Computer” by J. Davidson J. Mathieson and A. W. Boyne. “Determination of the Energy Dependence of the 63Cu (n an) 62Cu and 27Al (n p) 27Mg Cross-sections and their Applications to the Measurement of 14-MeV Neutron Fluxes,” by D. Partington D. Crumpton and S. E. Hunt. “Determination of MONG in Place of Organic Residue for Glycerine Analysis,” by L. V. Cocks J. Devine and F. B. Gibbs. “The Gas-chromatographic Determination of Ethyl-6,7-di-isobutoxyquinoline-3-carb- oxylate in Animal Feeding Stuffs,” by R. A. Hoodless and R. E. Weston. “A Rapid Method for the Determination of Mercury in Urine,” by G. Lindstedt. “The Determination of Ethanol in Official Drug Preparations Part 11. An Evaluation of Multiple Internal Reflectance Infrared Spectrophotometry,” by J. S. Wragg and B. Peutrell.

ISSN:0037-9697    

DOI:10.1039/SA9690600212

出版商:RSC    

年代:1969

数据来源: RSC

摘要:

214 PUBLICATIONS RECEIVED Publications Received [Proc. SOC. Analyt. Chew The publications listed below have been received by the Editor of The Analyst in which journal Book Reviews will continue to appear. PHARMACEUTICAL CHEMISTRY. VOLUME 2. INSTRUMENTAL TECHNIQUES. Edited by L. G. CHRTTEN. Pp. xiv + 773. New York and London Marcel Dekker Inc. 1969. Price $29.50. A MODERN LABORATORY COURSE. PHYSICAL CHEMISTRY. Edited by HUGH W. SALZBERG JACK I. MORROW STEPHEN R. COHEN and MICHAEL E. GREEN. New York and London Academic Press. 1969. Price 89s. IJEc-ruREs. slovak Academy of Sciences and Czechoslovak Chemical Society. Butterworth & Co. 1969. Price 100s. Pp. xx + 528. Xx1S.T INTERNATIONAL CONGRESS O F PURE AND APPLIED CHEMISTRY. PRAGUE 1967. CONGRESS International Union of Pure and Applied Chemistry in Conjunction with Czecho- Pp.vi + 273. London REFLECTANCE SPECTROSCOPY. PRINCIPLES METHODS APPLICATIONS. By G. KORTUM. Trans- lated from German by JAMES R. LOHR. Berlin Heidelberg and New York Springer-Verlag. 1969. Price DM78. THE Use OF CHEMICAL LITERATURE. Pp. xii + 294. London Butterworth & Co. 1969. Price 65s. FOOD INDUSTRIES MANUAL. EDITED BY ANTHONY WOOLLEN B.Sc. A.R.C.S. F.R.I.C. F.I.S.T. Twentieth Edition. Pp. x + 509. London Leonard Hill. 1969. Price 210s. APPLIED SPECTROSCOPY REVIEWS. VOLUME 2. Edited by EDWARD G. BRAME JR. Pp. viii + 376. New York and London Marcel Dekker Inc. 1969. Price $17.50. FLUORINE CHEMISTRY REVIEWS. VOLUME 3. Edited by I’AUI TARRANT. Pp. vi + 154. New Uork and London Marcel Dekker Inc. 1969. Price $12.50. POISON DETECTION IN HUMAN ORGANS.By ALAN CURY M.A. Ph.D. F.R.I.C. M.C.Path. Second Edition. Pp. xxiv + 280. Springfield Illinois U.S.A. Charles C. Thomas. 1969. Price $13.50. ORGANIC ELECTRONIC SPECTRAL DATA. VOLUME 5. 1960-1961. Edited by J. P. PHILLIPS ROBERT E. LYLE and P. l i . JONES. Pp. vi + 1019. New York London Sydney and Toronto Interscience Publishers a division of John Wiley & Sons. SCHWEIZERISCHES LEBENSMITTELRUCH. VOLUME 1. PART 2. Loose Leaf. Pp. vii-xiv +- 212. Bern Eidg. Drucksachen-und Materialzentrale. 1968. Price Fr6O. REPoRrs ON THE PROGRESS OF APPLIED CHEMISTRY. VOLUME 1,111. Pp. iv + 853. London Society of Chemical Industry. 1968. Price Ll0. ADVANCES IS ACTIVATION ANALYSIS. Edited by J. M. A. T,ENIHAN and S. J. THOM- SON. Pp. x + 223. London and New York Academic Press. 1969.Price 65s. ELEMENTAL ANALYSIS IN GEOCHEMISTRY. PART A. MAJOR ELEMENTS. METHODS IN GEO- CHEMISTRY AND GEOPHYSICS. By ALEXIS VOLBOKTH. Pp. xvi + 375. Amsterdam London and New York Elsevier Publishing Co. 1969. Price 135s. ANNUAL REPORTS ON THE PROGRESS OF CHEMISTRY FOR 1968. VOLUME 65. SECTION B. ORGANIC CHEMISTRY. Pp. iv + 684. London The Chemical Society. 1969. Price 75s. ENZYME HANDBOOK. VOLUME 1. By THOMAS E. BARMAN. Pp. xii + 499. Berlin Heidelberg and New York Springer-Verlag. 1969. ENZYME HANDBOOK. VOLUME 2. By THOMAS E. BARMAN. Berlin Heidel- berg and New York Springer-Verlag. 1969. Price DM78; $19.50. S.I. TJNITS IN ENGINEERING. By DEANE R. BLACKMAN B.Mech. E.M.Eng. Sc. Ph.D. M.I.E.Aust. Pp. vi + 56. Melbourne and London Macmillan & Co. Ltd. 1969. Price 15s. ORGANIC SYNTHESIS. By ROBERT E. IRELAND. Pp. xii + 147. Englewood Cliffs N. J. Prentice- Hall Inc. 1969. Price 40s. AN INTRODUCTION TO THERMOGRAVIMETKY. By C. J. KEATTCH F.R.I.C. Pp. vi + 59. London Heyden & Son Ltd. 1969. Price $4.50. Pp. vi + 366. EDITED BY K. T. BOTTLE. Second Edition. 1969. Price 328s. VOLUME 1. Pp. iv -+ 501-928. (Volumes 1 and 2 are not sold separately).

ISSN:0037-9697    

DOI:10.1039/SA9690600214

出版商:RSC    

年代:1969

数据来源: RSC

摘要:

December 19691 NOTICES 215 Radiochemical Methods Group FOLLOWING a very successful exhibition in June 1968 the Radiochemical Methods Group of the Society for Analytical Chemistry proposes to hold another similar exhibition on July 9th 1970. It will be held at the Borough Polytechnic London S.E.l and will be restricted to manufacturers who supply radiochemical equipment or equipment ancillary to radiochemical work. Anybody who is interested in exhibiting or who requires further information please apply to Mr. M. A. Crook Department of Chemistry and Chemical Technology Borough Polytechnic Borough Road London S.E.l. 216 [Proc. SOC. Analyt. Cheutz. THE CHEMICAL SOCIETY’S LIBRARY MEMBERS of the Society have the privilege of using the Library of the Chemical Society a t Burlington House London W1V OBN.The following publications of analytical interest have been added to the Library since the last list appeared in Proceedings (1969 6 177). A LABORATORY MANUAL OF ANALYTICAL METHODS OF PROTEIN CHEMISTRY. VOLUME 5. Edited by American Chemical American P. ALEXANDER and H. P. LUNDGREN. Pergamon Press. 1969. Society Division of Agricultural and Food Chemistry Symposium Miami Beach 1967. Chemical Society. 1969. Symposium Montreal 1968. American Institute of Chemical Engineers. 1969. ELECTROCHEMICAL ANALYSISECTION SUMMARY OF ACTIVITIES JULY 1968 TO JUNE 1969. chemical Analysis Section Analytical Chemistry Division Institute for Materials Research. by R. G. BATES. National Bureau of Standards. 1969. Plenum Press. 1969. PESTICIDAL FORMULATIONS RESEARCH PHYSICAL AND COLLOIDAL CHEMICAL ASPECTS.SAFETY IN AIR AND AMMONIA PLANTS. VOLUME 11. Committee 5-61 Air and Ammonia Plants Safety The Electro- Edited MODERN ASPECTS OF ELECTROCHEMISTRY. No. 5. Edited by J. O’M. BOCKRIS and B. E. CONWAY. NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY. F. A. BOVEY. Academic Press. 1969. CHEMICAL REACTIONS IN SOLVENTS AND MELTS. G. CHARLOT and B. TREMILLON. PHARMACEUTICAL CHEMISTRY. VOLUME 2. Edited by L. G. CHATTEN. Dekker. 1969. NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY INTERNATIONAL SYMPOSIUM. 1st English Edition Pergamon. 1969. Chemical Society Nuclear Magnetic Resonance Discussion Group Symposium Birmingham 1969. POLAROGRAPHY OF METAL COMPLEXES. D. R. CROW. Academic Press. 1969. INSTRUMENTAL METHODS OF CHEMICAL ANALYSIS. G. W. EWING. Third Edition. McGraw-Hill. 1969. ELECTROCHEMICAL TECHNIQUES FOR INORGANIC CHEMISTS.J. B. HEADRIDGE. Academic Press. 1969. ANALYSIS INSTRUMENTATION. Volume 6. Instrument Society of America. 14th Analysis Instrumentation Division Symposium Phila- delphia 1968. Plenum Press. 1969. Organised by the Gas Chromatography Discussion Group of the Institute of Petroleum. 7th International Symposium on Gas Chromatography and its Exploitation Copenhagen 1968. Institute of Petroleum. 1969. COCURRENT GAS-LIQUID FLOW. Edited by EDWARD RHODES and DONALD S. SCOTT. International Symposium on Research in Cocurrent Gas-Liquid Flow Waterloo Ontario 1968. 1969. APPLICATIONS OF NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY IN ORGANIC CHEMISTRY. L. M. JACKMAN and S. STERNHELL. Second Edition. Pergamon. 1969. ANALYTICAL CHEMISTRY OF Low CONCENTRATIONS.I. M. KORENMAN. Israel Program for Scientific Translations. 1968. ION EXCHANGE AND SOLVENT EXTRACTION OF METAL COMPLEXES. Wiley. Edited by LEWIS FOWLER B. L. CONNELLY and R. G. KRUEGER. GAS CHROMATOGRAPHY 1968. Edited by C. L. A. HARBOURN and R. STOCK. Plenum Press. Y. MARCUS and A. S. KERTES. 1969. LIPID CHROMATOGRAPHIC ANALYSIS. Edited by G. V. MARINETTI. Volume 2. Marcel Dekker. 1969. ORGANIC ELECTRONIC SPECTRA DATA. Volume 5. 1960-1961. Edited by J. P. PHILLIPS ROBERT E. A PROGRAMMED INTRODUCTION TO GAS-LIQUID CHROMATOGRAPHY. Heyden & Son COMPLEXOMETRIC TITRATIONS. G. SCHWARZENBACH and H. FLASCHKA. Second English Edition. ENCYCLOPEDIA OF INDUSTRIAL CHEMICAL ANALYSIS. Volume 7. LYLE and PAUL R. JONES. Organic Electronic Spectral Data Inc. Interscience. 1969. Ltd. 1969. J.B. PATTISON. Methuen. 1969. Interscience. 1968. Edited by F. D. SNELL and C. L. HILTON. December 19691 ANNOUNCEMENTS 217 INTERNATIONAL UNION OF PURE AND APPLIED CHEMISTRY Information Bulletin Nuvaber 36 November 1969 THE bulletin includes one of the Plenary Lectures presented at the International Symposium on Analytical Chemistry Birmingham July 1969 “Analytical Methods for the Study of Air Pollution” by Phillip W. West. The IUPAC information bulletin No. 36 November 1969 can be obtained from Butter- worth Scientific Publications London (price not yet available). BRITISH STANDARDS INSTITUTION DRAFT SPECIFICATIONS A FEW copies of the following draft specifications issued for comment only are available to members of the Society and can be obtained from the Secretary The Society for Analytical Chemistry 9/10 Savile Row London WIX 1AF. Draft Specifications prepared by Sub-Committee CIC/4/5-Alcohols Ketones Esters 69/27345-Draft B.S. Specification for Diacetone Alcohol (Metric Units) (Revision 69/27346-Draft B.S. Specification for Amy1 Acetate (Metric Units) (Revision of Draft Specification prepared by Technical Committee DAFA/3-Chemical Analysis of 69/290S4-Draft B.S. Specification for Density Hydrometers for Use in Milk Ethers and Amino Compounds. of BS 549 1964). BS 552 1957). Butter Milk Cheese etc. (Revision of BS 734 Part 1) (Metric Units).

ISSN:0037-9697    

DOI:10.1039/SA969060215b

出版商:RSC    

年代:1969

数据来源: RSC

摘要:

December 19691 ANNOUNCEMENTS 217 Announcements For the analyst . . A new spectrophotometer has been introduced by Pye Unicam Ltd. of Cambridge. The Unicam SP1800 Ultraviolet Spectrophotometer is a double-beam instrument covering the ultraviolet and visible spectral regions and incorporates many advanced technical features. The basic instrument gives direct reading on the built-in meter in linear absorbance on four switched scales. When the AR25 Recorder is fitted wavelength scans and fixed wavelength recording are possible. The automatic Unicam SP1800 System incorporates a programme controller automatic cell changer and a recorder or digital printer. A new free-standing Vacuum Regulator which permits the maintenance of vacuum in an apparatus system to a constant pre-determined level down to 1 torr has been introduced by Quickfit and Quartz Ltd.Stone Staffs. The Regulator has two glass chambers which are evacuated to the required degree whereupon one chamber is isolated and the unit is function- ing. Any subsequent leak in the system will disturb the equilibrium which will automatic- ally re-introduce pumping to the system until the original degree of vacuum is re-established. 218 [Proc. SOC. Analyt. Chewz REPRINTS of the following Review Papers published in The Analyst are available from The Society for Analytical Chemistry Book Department 9/10 Savile Row London W1X 1AF (not through Trade Agents). Orders MUST be accompanied by a remittance for the correct amount made out to “Society for Analytical Chemistry.” “Ferrous Metallurgical Analysis,” by €3. Bagshawe (August 1959).“The Analytical Chemistry of Zirconium,” by G. W. C. Milner and J . W. Edwards (February “Flame-photometric Methods in Metallurgical Analysis,” by John A. Dean (September 1960). “The Oxygen Flask Method,’’ by A. M. G. Macdonald (January 1961). “Analytical Chemistry of Beryllium,” by L. E. Smythe and R. N. Whittem (February 1961). “Determination of Residual Organo-phosphorus Insecticides in Foodstuffs,” by E. D. Chilwell “Biological Standardisation and the Analyst,’> by J. W. Lightbown (April 1961). Price 5s. “The Toxicology of Nitrates and Nitrites with Particular Reference to the Potability of Water “Emission Spectroscopy of Solutions,” by L. G. Young (January 1962). “Analytical Applications of the Mercury Electrode,” by J . A. Page J . A. Maxwell and R. P. “Classification of Methods for Determining Particle Size,’* by the Particle Size Analysis “Methods of Separation of Long-chain Unsaturated Fatty Acids,” by A.T. James (August “Beer’s Law and its Use in Analysis,” by G. F. Lothian (September 1963). “A Review of the Methods Available for the Detection and Determination of Small Amounts “Circular Dichroism,” by R. D. Gillard (November 1963). “Information Retrieval in the Analytical Laboratory,” by D. R. Curry (November 1963)” “Thermogravimetric Analysis,” by A. W. Coats and J . P. Redfern (December 1963). Price 5s. “Some Analytical Problems Involved in Determining the Structure of Proteins and Peptides,” “The Faraday Effect Magnetic Rotatory Dispersion and Magnetic Circular Dichroism,” by “Electrophoresis in Stabilizing Media,” by D. Gross (July 1965).“Recent Developments in the Measurement of Nucleic Acids in Biological Materials,” by “The Analysis for Residues of Chlorinated Insecticides and Acaricides,” by K. I. Beynon and “Radioisotope X-ray Spectrometry,” by J. R. Rhodes (November 1966). “The Determination of Iron(1r) Oxide in Silicate and Refractory Materials,” by H. N. S. “Activation Analysis,” by R. F. Coleman and T. B. Pierce (January 1967). “Techniques in Gas Chromatography. Choice of Solid Supports,” by J. F. Palframan Price 5s. “Heterocyclic Azo Dyestuffs in Analytical Chemistry,” by R. G. Anderson and G. Nickless “Determination of Residues of Organophosphorus Pesticides in Food,” by D. C. Abbott and “Radioactive Tracer Methods in Inorganic Trace Analysis Recent Advances,’’ by J. W. “Gamma-activation Analysis,” by C.A. Raker (October 1967). “Precipitation from Homogeneous Solution,” by P. F. S. Cartwright E. J. Newman and D. W. Wilson (November 1967). “Industrial Gas Analysis,” by (the late) H. N. Wilson and G. M. S. Duff (December 1967). Price 7s. 6d. “The Application of Atomic-absorption Spectrophotometry to the Analysis of Iron and Steel,” by P. H. Scholes (April 1968). “Inorganic Ion Exchange in Organic and Aqueous - Organic Solvents,” by G. J. Moody and J . D. R. Thomas (September 1968). “Radiometric Methods for the Determination of Fluorine,” by J. K. Foreman (June 1969). Price 5s. “Techniques in Gas Chromatography. Developments in the van Deemter Rate Theory of Column Performance,” by E. A. Walker and J. F. Palframan (August 1969). Price 5s. Price 5s. 1960). Price 5s. Price 5s. Price 5s. Price 5s. and G. S. Hartley (March 1961). Price 5s. Supplies,” by E. H. W. J. Burden (July 1961). Price 2s. 6d. Price 5s. Graham (April 1962). Price 5s. Sub-committee of the Analytical Methods Committee (March 1963). 1963). Price 5s. Price 5s. Price 5s. of Cyanide,” by L. S. Bark and H. G. Higson (October 1963). Price 5s. Price 2s. 6d. Price 2s. 6d. by Derek G. Smyth and D. F. Elliott (February 1964). J . G. Dawber (December 1964). Price 5s. Price 5s. Price 5s. H. N. Munro and A. Fleck (February 1966). K. E. Elgar (March 1966). Price 5s. Price 5s. Price 5s. Schafer (December 1966). Price 5s. Price 5s. Part I. and E. A. Walker (February 1967). (April 1967). Price 5s. H. Egan (August 1967). McMillan (September 1967). Price 5s. Price 5s. Price 5s. Price 5s. Price 5s. Price 7s. 6d. Part 11.

ISSN:0037-9697    

DOI:10.1039/SA9690600217

出版商:RSC    

年代:1969

数据来源: RSC